To design and simulate a Half Wave Rectifier circuit.
EDWin Components Used
Number of components
Ac voltage source
The Half wave rectifier is a circuit, which converts an ac voltage to dc voltage.
In the Half wave rectifier circuit shown above the transformer serves two purposes.
It can be used to obtain the desired level of
dc voltage (using step up or step down transformers).
It provides isolation from the power line.
The primary of the transformer is connected to ac supply. This induces an ac voltage
across the secondary of the transformer. During the positive half cycle of the input
voltage the polarity of the voltage across the secondary forward biases the diode.
As a result a current IL flows through
the load resistor, RL. The forward biased
diode offers a very low resistance and hence the voltage drop across it is very small. Thus the voltage appearing across the load is practically
the same as the input voltage at every instant.
During the negative
half cycle of the input voltage the polarity of the secondary voltage gets reversed.
As a result, the diode is reverse biased. Practically no current flows through the circuit
and almost no voltage is developed across the resistor. All input voltage
appears across the diode itself.
Hence we conclude that when the input voltage is going through
its positive half cycle, output voltage is almost the same as the input voltage and during the negative half cycle no voltage is
available across the load. This explains the unidirectional pulsating dc
waveform obtained as output. The process of removing one half the
input signal to establish a dc level is aptly called half wave
Peak Inverse Voltage
When the input voltage reaches its maximum value Vm
during the negative half cycle the voltage across the diode is also maximum. This maximum voltage is known as the peak inverse
voltage. Thus for a half wave rectifier
Let Vi be the voltage to the primary of the transformer. Vi
is given by
where Vr is the cut-in voltage
of the diode.
Ripple factor is defined as the ratio of rms value of ac component to
the dc component in the output.
Vav the average or the dc content
of the voltage across the load is given by
RMS voltage at the load resistance can be calculated as
Efficiency, h is the ratio of the dc output
power to ac input power
Transformer Utilization Factor
Transformer Utilization Factor, TUF can be used to determine the rating
of a transformer secondary.
In half wave rectifier the rated voltage of the transformer secondary
But actually the RMS current flowing through the winding is only .
Form factor is given by,
Peak factor is given by,
EDWinXP -> Schematic Editor: The circuit diagram is
drawn by loading components from the library. Wiring and proper net
been made. The values are assigned for relevant components.
EDWinXP -> Mixed Mode Simulator:
The circuit is preprocessed. The test points and waveform markers are
placed in input and output of the circuit. GND net is set as reference net. The Transient Analysis
parameters have been set. The Transient Analysis is executed and output waveform is observed in Waveform Viewer.
The output waveform may be
observed in the waveform viewer.